CN110875891A - Signal processing method and device - Google Patents
Signal processing method and device Download PDFInfo
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- CN110875891A CN110875891A CN201811017202.1A CN201811017202A CN110875891A CN 110875891 A CN110875891 A CN 110875891A CN 201811017202 A CN201811017202 A CN 201811017202A CN 110875891 A CN110875891 A CN 110875891A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
Abstract
The embodiment of the invention discloses a signal processing method and a signal processing device, wherein the signal processing method comprises the following steps: carrying out frequency spectrum shifting on the n paths of digital intermediate frequency signals, so that the n paths of frequency spectrum shifted signals are not overlapped on a frequency domain; superposing n paths of digital intermediate frequency signals subjected to frequency spectrum shifting into one path of signal; wherein n is an integer greater than or equal to 2; carrying out digital pre-distortion processing on the superposed signals; and separating the signals after the digital pre-distortion processing to obtain n paths of signals. The embodiment of the invention carries out frequency spectrum shifting on n paths of digital intermediate frequency signals, then superposes the n paths of digital intermediate frequency signals into one path of signals, and then carries out digital pre-distortion treatment, the signals after frequency spectrum shifting are required to be ensured not to be superposed in a frequency domain, the superposed signals pass through the same DPD, nonlinear distortion among the signals generated when the signals pass through the same amplifier is compensated, frequency points after shifting are randomly selected on the premise of ensuring that the signals do not be superposed in the frequency domain, and the frequency points do not influence the compensation effect of the nonlinear distortion of the signals.
Description
Technical Field
Embodiments of the present invention relate to, but not limited to, wireless technologies, and more particularly, to a signal processing method and apparatus.
Background
The microwave communication technology is a point-to-point data transmission mode with high efficiency and high reliability, and due to the fact that the microwave communication technology is wirelessly transmitted through space, cables do not need to be laid, the cost is lower than that of traditional optical fiber transmission, and the microwave communication technology is widely concerned in recent years.
A Power Amplifier (PA) is a key device of a microwave communication system, but due to the non-linear characteristic of a Power Amplifier, as the transmission Power increases, the output of the Amplifier is no longer in a linear amplification relation with the input, but saturation occurs, and the saturation distortion can be mathematically modeled as non-linear distortion.
Disclosure of Invention
The embodiment of the invention provides a signal processing method and a signal processing device, which can compensate nonlinear distortion when a signal passes through a Power Amplifier (PA).
The embodiment of the invention provides a signal processing method, which comprises the following steps:
carrying out frequency spectrum shifting on the n paths of digital intermediate frequency signals, so that the n paths of frequency spectrum shifted signals are not overlapped on a frequency domain; wherein n is an integer greater than or equal to 2;
superposing n paths of digital intermediate frequency signals subjected to frequency spectrum shifting into one path of signal;
carrying out digital pre-distortion processing on the superposed signals;
and separating the signals after the digital pre-distortion processing to obtain n paths of signals.
In the embodiment of the invention, a frequency interval exists between two adjacent paths of signals after the frequency spectrum shifting.
In this embodiment of the present invention, before the superimposing n channels of digital intermediate frequency signals into one channel of signal, the method further includes:
respectively normalizing the n paths of digital intermediate-frequency signals subjected to frequency spectrum shifting;
the superimposing the n paths of frequency spectrum shifted digital intermediate frequency signals into one path of signal comprises:
and superposing the n paths of normalized signals into one path of signal.
In this embodiment of the present invention, before the frequency spectrum shifting is performed on the n channels of digital intermediate frequency signals, the method further includes:
and respectively carrying out bit level processing, symbol level processing and digital intermediate frequency processing on the n paths of signals to be aggregated to obtain n paths of digital intermediate frequency signals.
In this embodiment of the present invention, the separating the signal after the digital pre-distortion processing to obtain n paths of signals includes:
and carrying out frequency spectrum shifting and filtering on the signal subjected to the digital pre-distortion processing to obtain n paths of signals.
An embodiment of the present invention provides a signal processing apparatus, including:
the frequency spectrum shifting module is used for carrying out frequency spectrum shifting on the n paths of digital intermediate frequency signals, so that the n paths of signals subjected to frequency spectrum shifting are not overlapped on a frequency domain; wherein n is an integer greater than or equal to 2;
the superposition module is used for superposing the n paths of frequency spectrum shifted digital intermediate-frequency signals into one path of signal;
the processing module is used for carrying out digital pre-distortion processing on the superposed signals;
and the separation module is used for separating the signal after the digital pre-distortion processing to obtain n paths of signals.
An embodiment of the present invention provides a signal processing apparatus, including a processor and a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions are executed by the processor, any one of the signal processing methods is implemented.
An embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of any one of the signal processing methods described above.
The embodiment of the invention comprises the following steps: carrying out frequency spectrum shifting on the n paths of digital intermediate frequency signals, so that the n paths of frequency spectrum shifted signals are not overlapped on a frequency domain; superposing n paths of digital intermediate frequency signals subjected to frequency spectrum shifting into one path of signal; wherein n is an integer greater than or equal to 2; carrying out Digital Predistortion (DPD) processing on the superposed signals; and separating the signals after the digital pre-distortion processing to obtain n paths of signals. The embodiment of the invention carries out frequency spectrum shifting on n paths of digital intermediate frequency signals, then superposes the n paths of digital intermediate frequency signals into one path of signals, and then carries out digital pre-distortion treatment, the signals after frequency spectrum shifting are required to be ensured not to be superposed in a frequency domain, the superposed signals pass through the same DPD, nonlinear distortion among the signals generated when the signals pass through the same amplifier is compensated, frequency points after shifting are randomly selected on the premise of ensuring that the signals do not be superposed in the frequency domain, and the frequency points do not influence the compensation effect of the nonlinear distortion of the signals.
Additional features and advantages of embodiments of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of the invention. The objectives and other advantages of the embodiments of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the examples of the invention serve to explain the principles of the embodiments of the invention and not to limit the embodiments of the invention.
Fig. 1 is a flowchart of a signal processing method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a signal processing apparatus according to another embodiment of the present invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments of the present invention may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
By adopting a Digital Predistortion (DPD) technology, Predistortion correction is carried out on a baseband signal at a transmitting end, and nonlinear distortion of the signal can be reduced when the transmitting power is larger.
Different frequency resources can be integrated in carrier aggregation, the frequency spectrum utilization rate is improved, in a carrier aggregation scene, a plurality of paths of signals participating in aggregation pass through one PA, different paths of signals can affect each other, and the non-linear distortion of the PA can not be improved by adopting a single carrier DPD compensation method.
Referring to fig. 1, an embodiment of the present invention provides a signal processing method, including:
step 100, carrying out frequency spectrum shifting on n paths of digital intermediate frequency signals, so that the n paths of frequency spectrum shifted signals are not overlapped on a frequency domain; wherein n is an integer greater than or equal to 2.
In another embodiment, in order to ensure effective separation of the signals after the digital predistortion processing, a frequency interval is required to exist between two adjacent paths of signals after the frequency spectrum shifting, and the minimum value of the frequency interval is based on that n paths of signals can be obtained through separation.
And 102, performing digital pre-distortion processing on the superposed signals.
And 103, separating the signals subjected to the digital pre-distortion processing to obtain n paths of signals.
In the embodiment of the present invention, the separating the signal after the digital pre-distortion processing to obtain n paths of signals includes:
and carrying out frequency spectrum shifting and filtering on the signal subjected to the digital pre-distortion processing to obtain n paths of signals.
For example, the signals after the digital pre-distortion processing may be respectively shifted to 0 frequency, and then Low Pass Filtering (LPF) may be performed to obtain n channels of signals.
In the embodiment of the invention, the n paths of separated signals are input into the PA to obtain the compensation of the nonlinear distortion.
In another embodiment of the present invention, before the n digital intermediate frequency signals are superimposed into one signal, the method further includes:
respectively normalizing the n paths of digital intermediate-frequency signals subjected to frequency spectrum shifting; specifically, the shifted digital intermediate frequency signal sum of each path of frequency spectrum is respectively taken
The ratio of (A) to (B);
the superimposing the n paths of frequency spectrum shifted digital intermediate frequency signals into one path of signal comprises:
and superposing the n paths of normalized signals into one path of signal.
In another embodiment of the present invention, before the frequency spectrum shifting the n digital intermediate frequency signals, the method further includes:
and respectively carrying out bit level processing, symbol level processing and digital intermediate frequency processing on the n paths of signals to be aggregated to obtain n paths of digital intermediate frequency signals.
The embodiment of the invention carries out frequency spectrum shifting on n paths of digital intermediate frequency signals, then superposes the n paths of digital intermediate frequency signals into one path of signals, and then carries out digital pre-distortion treatment, the signals after frequency spectrum shifting are required to be ensured not to be superposed in a frequency domain, the superposed signals pass through the same DPD, nonlinear distortion among the signals generated when the signals pass through the same amplifier is compensated, frequency points after shifting are randomly selected on the premise of ensuring that the signals do not be superposed in the frequency domain, and the frequency points do not influence the compensation effect of the nonlinear distortion of the signals.
The following describes in detail a specific implementation of an embodiment of the present invention by way of an example.
Examples of the invention
Four paths of signals to be aggregated independently output four paths of digital intermediate frequency signals z1,z2,z3,z4。
Firstly, four paths of signals to be aggregated are respectively subjected to bit level, symbol level and digital intermediate frequency processing to obtain four paths of digital intermediate frequency signals x1,x2,x3,x4。
Second, for four paths of digital intermediate frequency signals x1,x2,x3,x4Carrying out spectrum shifting and selecting the frequency point w of the spectrum shifting1,w2,w3,w4To ensure that the signals after the spectrum frequency shift do not overlap in the frequency domain and ensure a certain frequency interval, taking a 50M bandwidth and a 500MHz sampling frequency as an example, the following may be respectively selected:
w1＝2π·80/500
w2＝-2π·80/500
w3＝2π·160/500
w4＝-2π·160/500
then it is determined that,
wherein, y1，y2，y3，y4The signals are the signals after four paths of frequency spectrum shifting.
And thirdly, normalizing the four paths of signals subjected to frequency spectrum shifting and then superposing the signals into one path of signal.
In particular, according to the formula
Superposing into a path of signal;
wherein y is the superimposed signal.
And fourthly, carrying out DPD processing on the superposed signals.
In particular, according to the formula ydpd＝y(g1+g3|y|2) And carrying out DPD processing on the superposed signals.
Wherein, ydpdFor DPD processed signals, g1For linear distortion terms, i.e. first order distortion, g3Is a nonlinear distortion term, namely third order distortion.
The fifth step, for ydpdCarrying out frequency spectrum shifting and low-pass filtering to obtain four-path digital intermediate-frequency signal z1,z2,z3,z4。
In particular, according to the formula
For ydpdAnd carrying out frequency spectrum shifting and low-pass filtering.
Referring to fig. 2, another embodiment of the present invention provides a signal processing apparatus, including:
the frequency spectrum shifting module 201 is configured to perform frequency spectrum shifting on the n paths of digital intermediate frequency signals, so that the n paths of frequency spectrum shifted signals do not overlap in a frequency domain; wherein n is an integer greater than or equal to 2;
the superposition module 202 is configured to superpose the n channels of frequency spectrum shifted digital intermediate-frequency signals into one channel of signal;
the processing module 203 is configured to perform digital predistortion processing on the superimposed signal;
and the separation module 204 is configured to separate the signal after the digital pre-distortion processing to obtain n paths of signals.
In the embodiment of the invention, a frequency interval exists between two adjacent paths of signals after the frequency spectrum shifting.
In an embodiment of the present invention, the separation module 204 is specifically configured to:
and carrying out frequency spectrum shifting and filtering on the signal subjected to the digital pre-distortion processing to obtain n paths of signals.
In the embodiment of the present invention, the stacking module 202 is specifically configured to:
respectively normalizing the n paths of digital intermediate-frequency signals subjected to frequency spectrum shifting; and superposing the n paths of normalized signals into one path of signal.
In the embodiment of the present invention, the method further includes:
the preprocessing module 205 is configured to perform bit-level processing, symbol-level processing, and digital intermediate-frequency processing on the n channels of signals to be aggregated, respectively, to obtain n channels of digital intermediate-frequency signals.
Another embodiment of the present invention provides a signal processing apparatus, including a processor and a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions are executed by the processor, the signal processing apparatus implements any one of the signal processing methods described above.
Another embodiment of the present invention proposes a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of any of the signal processing methods described above.
Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer.
Although the embodiments of the present invention have been described above, the descriptions are only used for understanding the embodiments of the present invention, and are not intended to limit the embodiments of the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the embodiments of the invention as defined by the appended claims.
Claims (8)
1. A signal processing method, comprising:
carrying out frequency spectrum shifting on the n paths of digital intermediate frequency signals, so that the n paths of frequency spectrum shifted signals are not overlapped on a frequency domain; wherein n is an integer greater than or equal to 2;
superposing n paths of digital intermediate frequency signals subjected to frequency spectrum shifting into one path of signal;
carrying out digital pre-distortion processing on the superposed signals;
and separating the signals after the digital pre-distortion processing to obtain n paths of signals.
2. The signal processing method of claim 1, wherein a frequency interval exists between two adjacent paths of the spectrum shifted signals.
3. The signal processing method according to claim 1, wherein before the superimposing the n digital intermediate frequency signals into one signal, the method further comprises:
respectively normalizing the n paths of digital intermediate-frequency signals subjected to frequency spectrum shifting;
the superimposing the n paths of frequency spectrum shifted digital intermediate frequency signals into one path of signal comprises:
and superposing the n paths of normalized signals into one path of signal.
4. The signal processing method according to claim 1, wherein before the frequency spectrum shifting the n-channel digital intermediate frequency signals, the method further comprises:
and respectively carrying out bit level processing, symbol level processing and digital intermediate frequency processing on the n paths of signals to be aggregated to obtain n paths of digital intermediate frequency signals.
5. The signal processing method according to claim 1, 3 or 4, wherein the separating the digital pre-distortion processed signal to obtain n paths of signals comprises:
and carrying out frequency spectrum shifting and filtering on the signal subjected to the digital pre-distortion processing to obtain n paths of signals.
6. A signal processing apparatus comprising:
the frequency spectrum shifting module is used for carrying out frequency spectrum shifting on the n paths of digital intermediate frequency signals, so that the n paths of signals subjected to frequency spectrum shifting are not overlapped on a frequency domain; wherein n is an integer greater than or equal to 2;
the superposition module is used for superposing the n paths of frequency spectrum shifted digital intermediate-frequency signals into one path of signal;
the processing module is used for carrying out digital pre-distortion processing on the superposed signals;
and the separation module is used for separating the signal after the digital pre-distortion processing to obtain n paths of signals.
7. A signal processing apparatus comprising a processor and a computer-readable storage medium having instructions stored therein, wherein the instructions, when executed by the processor, implement a signal processing method according to any one of claims 1 to 5.
8. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the signal processing method according to any one of claims 1 to 5.
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| KR20050064485A (en) * | 2003-12-23 | 2005-06-29 | 삼성전자주식회사 | Predistortion apparatus and method for compensating non-linearility of the power amplifier |
| CN101146074A (en) * | 2006-09-15 | 2008-03-19 | 孟月萍 | Processing method for radio access system on downlink signals based on optical fiber radio |
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| CN105763495A (en) * | 2014-12-16 | 2016-07-13 | 中兴通讯股份有限公司 | Digital pre-distortion method and device |
| US20170338841A1 (en) * | 2016-05-19 | 2017-11-23 | Analog Devices Global | Wideband digital predistortion |
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2018
- 2018-08-31 CN CN201811017202.1A patent/CN110875891A/en not_active Withdrawn
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| KR20050064485A (en) * | 2003-12-23 | 2005-06-29 | 삼성전자주식회사 | Predistortion apparatus and method for compensating non-linearility of the power amplifier |
| CN101146074A (en) * | 2006-09-15 | 2008-03-19 | 孟月萍 | Processing method for radio access system on downlink signals based on optical fiber radio |
| CN102271105A (en) * | 2010-06-04 | 2011-12-07 | 电信科学技术研究院 | Intermediate frequency design method and device of broadband |
| CN105763495A (en) * | 2014-12-16 | 2016-07-13 | 中兴通讯股份有限公司 | Digital pre-distortion method and device |
| US20170338841A1 (en) * | 2016-05-19 | 2017-11-23 | Analog Devices Global | Wideband digital predistortion |
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